DE3810915C1 - Apparatus for continuously shaping the wall of a pipeline of thermoplastic material - Google Patents

Abstract

In an apparatus for continuously shaping the wall of pipes of thermoplastic material by means of a travelling hollow mould, which is made up of successive pairs of mould halves respectively at the beginning of the hollow mould, the two mould halves at the beginning of the hollow mould are connected rigidly to each other by means of safety bolts. For this purpose, the safety bolts or bolt actuating elements run against corresponding stops at the beginning of the working zone. At the end of the hollow mould, the safety bolts are opened again by bolt actuating elements running against corresponding stops, so that the mould halves can be moved apart.

Description

The invention relates to a device for continuous deformation the wall of a thermoplastic emerging from an extruder Plastic tubing in a still warm plastic condition, in which the Pipe string along a working distance in the wells on the com complementary to the desired external shape of the pipe string inside wall of a pipe string moving in the direction of extrusion migrating hollow form pressed in and solidified in this state which device provides two sequences of mold halves are, which run on self-contained guides and along the Ar beitsstrecke in guides running parallel to each other along a cavity mold butt the level and thus complement each other to form a moving hollow form zen, furthermore a device is provided which the shape holds halves together in the working section.

Such devices are widely known. They are exemplary as in the German patents 17 53 625 and 12 03 940 be wrote. They serve like those in the two patent documents mentioned ten described devices, for example, so-called Fal ten-, corrugated or corrugated pipes made of thermoplastic such as e.g. B. polyvinyl chloride or polyethylene. The extruded still thermoplastic plastic tubing by im Overpressure generated inside the pipe string or also by suction the air from the space between the inner wall of the mold and the extruded plastic tube brought into the mold strand nestled against the inner wall of the hollow mold. There the Plastic tubing then cooled so far that it after being off other guiding of the individual mold halves can be continued freely. In the pipes thus produced, each rib on the outer circumference corresponds to the A corresponding depression in the inner surface of the Tube. The devices further developed by the invention but can also be used to manufacture plastic pipes, which on the outside all around ribs and similar profiles point, but are smooth on the inside. Such pipes are to be produced  the thermoplastic plastic tube stranded by means of a piston held inside the same the inner wall of the hollow mold and into the recess of the latter pressed in. A device of the latter type is an example as described in German Patent 24 50 171.

The devices improved by the invention are natural not only for the production of simple pipes with corrugated or outside ribbed or otherwise profiled wall, you can just as well for the production of pipes with multiple walls such. B. from Double wall pipes are used in which the inner pipe is smooth and the outer pipe is corrugated or the inner tube is ribbed on the outside and the outer tube is smooth and what's more like that.

Likewise, the invention is not limited to such devices, where the mold halves of each sequence are practical all the way table consecutively without gaps - for example in chains connected - are guided in their endless path. The invention is equally applicable to devices in which the mold halves on End of the working section apart without swiveling or turning leads, moved back and back at the beginning of the work route are pushed together, as is above all for very large pipe diameter is advantageous.

In the known devices of the type outlined above, the Mold halves held together in the working section in that they (German Patent 17 53 625) run in a channel that the Mold halves of the two mold halves follow in the working section stands steadily against each other or by being at work stretch (German patent specification 12 03 940) of roller guides be pressed.

In devices for producing endless rods from cork particles and a suitable adhesive is also used with a wandering hollow shape worked. In these devices (US-PS 16 03 140) mutually opposite mold halves held together in that in a plane perpendicular to the circumferential plane of the mold halves  two other series of U-shaped brackets revolve around each other corresponding edge ribs at the beginning of each working section Apply the mold halves to the mold halves and at the end of the Working distance are deducted from their circulation device. Such a design makes the entire device structurally very complex and also requires a very precise production.

A device (GB-PS 6 73 205) has become known, which also like the invention with egg A migratory cavity mold that works in the working section individual mold halves is formed. Here are the mold halves held together that the mutually facing edges of the mold halves each interlock like a zipper. This principle is ever but not for devices as they want to improve the invention applicable, because with this principle who worked with a lot of play that must be when bringing together and separating the individual "Zipper links" should work, and since the links at Divide them apart when they are still in contact with the deformed tube.

Finally, the Austrian patent specification 19 16 10 is one Extrusion device for extruding profile bars and tubes knows, in which also the outer during a working distance Part of the extrusion nozzle from each other to the outer extrusion nozzle complementary mold halves is formed. Here are the mold halves through screw clamps attached to the mold halves, electromagnets and other known tensioners held together. Such a The procedure is for the practice with the devices that the inventions want to improve, not suitable because the attachment of screw force is extremely cumbersome and minimal ar speed allowed. The electromagnetic bracket of the individual mold halves would not only complicate them very much, but also lead to magnetic effects in the machine, that are highly undesirable. The forces to be absorbed here are also usually too high to be picked up by electromagnets could become.  

Especially when the device of the type outlined at the beginning the known size should be relatively large directions (roller or channel guides) no longer align to the shape to hold halves together perfectly. With channel guides in addition, the friction between the mold halves and the Ka Channel guidance too large. Wear is also great with roller guides high because the rollers run constantly under high load.

The invention solves the problem in particular in a device of initially outlined the device, which the mold halves in the working distance in the system holds together, so that from on the outside of the wandering hollow form no these forces holding together need to be exercised more, which eliminates the disadvantages set out above the known devices can be avoided and also he required drive power significantly reduced and finally the gait of the machine also becomes more even and less vibration.

The invention achieves the stated object in that the device device for holding the mold halves against each other on one Half of the mold movably mounted locking bolt, which is in the engaged position each behind an engagement surface on the opposite shape half grab that at the beginning of the work route a closure direction is provided, which there the locking bolt from a non engaged position in the engaged position, and that at the end an opening device is provided on the working section, which there the locking bolts from the engaged position into the non-engagement position moves.

In this way, the migrating hollow shape in the working section is over practically rigid form rings, which are light and let it advance with little effort.

The locking bolts can be made, for example, as pivotable hooks forms, that around in the axial direction of the hollow shape Swivel axes are pivotable and in their two end positions Engaged position and the non-engaged position each locked are. The closing device and also the opening device  can in this case, for example, of rotating camshafts be formed, the individual cams each running past capture a corresponding nose of the hook and engage it position or swivel out of this. The camshafts expediently also in the axial direction of the hollow mold The rotating axes can rotate from the general drive of the device be driven. However, it is also possible to use these camshafts to be replaced by swivel links by drive surfaces on the Mold halves themselves are pivoted accordingly, so that they Grasp the hook and bring it into or out of engagement.

Another way of realizing the invention is to that a locking pin on a mold half in a guide that in Axial direction of the hollow shape runs and the locking pin for example by means of a swivel lever at the start of the working route so that he leads into a corresponding leadership that here the first-mentioned leadership is aligned, occurs. At the end of the work then the actuation of the swivel arm must be reversed.

In principle, the locking pin can of course also lower in one direction be stored and movable right to the axis of the mold. A lead tion and the corresponding leadership of the opposite form half must then be arranged accordingly. This arrangement has the advantage that the locking pin is then relatively simple common stops against which a lateral projection of the locking pin tes starts up, can be brought into and out of engagement.

If the construction is stiff enough, it is sufficient to move the locking device gel only on one of the two edges of a pair of mold halves form to attach. However, this is structurally complex. In particular even with larger diameters, it is therefore according to a further development extension of the invention preferred that separate locking bolt and Ver Closing and opening devices for each of the two mold halves edges are provided.

According to a development of the invention, the device is preferred tion designed so that the locking bolt in parallel to the parting plane  the hollow form running guides of the mold halves supporting it leads and that the engagement surfaces of the opposite shape halves also run essentially parallel to the parting plane. Here again it is preferred that the center of the locking bolt located in the parting plane of the migrating hollow shape, or at least close to this.

The locking bolts are preferred according to a further development of the Erfin manure plate-shaped. This has the advantage that with right relatively large surfaces in their guide and on the engagement surface can rest against the opposite mold half. To make it easy To enable mobility and easy guidance of the locking bolts these are advantageous by perpendicular to the parting plane of the hollow mold extending axes pivotable in the mold halves supporting them device. This allows the necessary to move the locking bolt Forces can be kept low and there is a risk of jamming can also be switched off.

According to a preferred development of the invention, the locks gel as essentially extending in the direction of travel of the hollow form plate-shaped arms formed in the non-engaged position a small angle from the axis of the mold and in the one handle position also a small, but preferably size Ren angle of, for example, 10 ° or 15 ° to the axis of the hollow mold protrude. In this training, the level of the locking bolt forming plate parallel to the parting plane of the mold.

According to a development of the invention, the barriers are preferably latch operated by means of pins protruding laterally from them bar, which corresponds to the beginning and end of the work route appropriate stops of the closing and opening devices can be actuated. The operation takes place here each in that the pin against corresponding slopes of the start beating.

According to a further preferred development of the invention, the Locking bolt by means of swivel levers acting on its free ends can be actuated on shafts running perpendicular to the parting plane  sit at their ends spaced from the parting plane Wear levers with which to operate against at the beginning and end stops of the closing and opening devices arranged along the working path. While at in a horizontal plane encircling mold halves the latter leadership sits advantageously on the underside of the mold halves, because there the mold halves usually, especially in the case of larger training a support plate or another support device, will the first-mentioned version, in which the locking bolt by means of Lich protruding pins are actuated, the stops tarnish, advantageously used on the top of the mold halves, because you have space there to stop at the beginning and end of work stretch close to the parting plane of the mold halves.

The locking bolts can be in the engaged position or in the non-position handle position can be held by, for example, the connections to extend it until the next operation is reached. Another possibility is to do this in that the locking bolts are provided with locking devices, which moving the locking bolt from the engaged position or not engagement position only with the application of a correspondingly large force enables.

With regard to the positioning of the closing device and the Opening device is still to be pointed out that the former so early At the beginning of the working section it must be arranged that the mold halves are already locked together when the internal pressure in we begins to act on them to a considerable degree and that the latter ver The lock may only be opened when the internal pressure is set to off pushing the mold halves acts, is essentially degraded.

The preferred embodiment of the invention is described below of the drawings described as an illustrative example.

Fig. 1 shows a highly schematic and simplified top view of a device according to the invention, but only a part of the mold halves is shown and almost all non-essential to the invention parts of the omitted for clarity.

FIG. 2 shows the view from below on FIG. 1, that is to say the side view of the device, only three mold halves being shown here and parts which are not essential to the invention are not shown.

Fig. 3 shows the section III-III of Fig. 2 on an enlarged scale rod, but the mold halves themselves are not shown cut.

Fig. 4 shows the top view of the left half of the mold in Fig. 3, the locking guide of this half of the mold being partly cut along the line IV-IV in Fig. 3.

Fig. 5 shows the top view of the upper part of the right half of the mold in Fig. 3 with its latch holder.

Fig. 6 shows the section VI-VI of Fig. 3 through the lower bolt guide and the lower bolt receptacle.

Fig. 7 shows the view from above in Fig. 3 on the lower Riegelauf acquisition.

The device shown is z. B. such for the production of Fal ten- or corrugated pipes with a relatively large diameter. The pipe string is fed along the machine axis 1 in FIGS. 1 and 2 from the right from an extruder nozzle which extends to the beginning of the working section A indicated by a double arrow in FIG. 1. The finished corrugated tube emerges in Fig. 1 left in the direction of Pfei les 2 . In this device, the traveling hollow shape is formed by two sequences of left-hand mold halves 3 and right-hand mold halves 4 (based on FIG. 3). As best seen in FIG. 1, Lich, each of these two sequences of mold halves runs around a self-contained racetrack-shaped guide, which leads the chain guiding devices via deflection wheels 5 before the start of the working section and behind the end of the working section. The shapes are guided in the area of the working section and also in front of and behind it between guides 8 , not shown in FIGS. 1 and 2, which are fastened on the base plate 7 . The feedback are indicated in Fig. 1 at 9 . As far as previously described in the context of the exemplary embodiment, the principle of the device is concerned, for example known from German patent specification 17 53 625 or German patent specification 12 03 940, and is therefore not explained and illustrated in detail here. In such a device occur especially when large pipe diameters are ge or the formation of the pipe wall takes place under considerable pressure, inside the formed from the mold halves 3 and 4 wan changing hollow shape large, the two rows of mold halves 3 and 4 in the working distance from each other separate sought-after forces. According to the invention, these forces are directly and completely compensated for by the fact that the mold halves are clamped together by means of bolts during the passage of the ar beitsstrecke (in Fig. 2 and 3) above and below, so that these forces no longer have to be absorbed from the outside. In Fig. 3 you can see on the base plate 7, the guides 8 of the working section, which guide the mold halves between them so that they run along the mold parting line 10 without spacing. The mold halves each consist of a molded shell carrier 3 a and a molded shell 3 b or a molded shell carrier 4 a and a molded shell 4 b . The molded shells and the molded shell supports are clamped and screwed together in a manner that is not apparent from the drawing. In order to transmit the forces to be absorbed as directly as possible, the locking devices are preferably provided directly on the molded shells. But you can also sit on the molded shell carriers.

As seen from Fig. 1 to 3, each left mold half 3 ver current pin has on the outer periphery of the hollow mold parting plane 10, an upper latch guide 14 in which a locking bolt 15 by a perpendicular to the separation plane 10 53 (FIG. 4) is pivotally mounted. The locking bolt 15 engages in its shown in Fig. Locked position 3 with its downwardly projecting beard 19 similar to the locking bolt 22 in Fig. 6 in a latch receiver 16 to read the joint close to the upper edge of the partition 10 on the shell mold 4 b located. The bolt receptacle 16 is screwed to the molded shell 4 b by only indicated screws 17 , while the bolt guide 14 is screwed to the molded shell 3 b by only indicated screws 18 . For locking the bottom of the mold parting plane also each left shell mold 3 carries a lower b bolt guide 20 in which to the perpendicular to the parting plane 10 bolt 21, a further locking bolt is pivotally mounted 22nd In its locked position shown in Fig. 3, the locking bolt 22 engages with his beard 30 in the bolt receptacle 23 , which is screwed to the right in Fig. 3 shell 4 b , while the bolt guide 20 is screwed to the left shell 3 b is. As can be seen from the drawing, the lower bolt guides and bolt receptacles with respect to the parting plane are essentially symmetrical, while for constructional reasons at the top of the molded shells 3 b and 4 b the arrangement is slightly shifted to the right molded shell 4 b .

The screws with which the bolt guide 20 is attached to the left-hand mold shell 3 b are only indicated as a center line 25 in FIG. 3. The fastening screws for the bolt receptacle 23 are indicated at 26 in FIG. 3. The corresponding tapped holes are known in FIG. 7.

Both locking bolts 15 and 22 have the form of plates, the outline of which can be seen in FIG. 6.

As best seen in Fig. 3 and Fig. 6, the lower Rie gelführung 20 has essentially the shape of a cuboid, which is penetrated by a longitudinal slot, which is at the front end in the mold travel direction in the working distance over the entire height of the cuboid stretches ( Fig. 6), while the slot extends in the rear two thirds of its length only from below over half the height of the locking guide 20 . In this slot or the guide 28 , the plate-shaped locking bolt 22 between its two end positions shown in FIG. 6 is pivotable. In its lower swivel position, it engages with its beard 30 in the receiving groove 31 of the lower latch receptacle 23 . The beard 30 has a slight suit on its flank on the left in FIG. 3, that is to say in FIG. 6 behind the plane of the drawing, so that it lies tightly against the corresponding wall of the receiving groove 31 , since this wall, as can be seen in FIG. 7, also has a light suit. The bolt 33 is used to actuate the locking bolt 22 and is seated on a pivot lever 34 of the shaft 35 (FIGS . 3 and 6) extending perpendicular to the parting plane 10 . Thus, if the shaft 35 is rotated clockwise in FIG. 6, the bolt 33 guided in the locking bar 22 by means of an elongated hole 36 and thus the locking bar 22 from its fully extended lower locked position into the upper position shown in dash-dotted lines in FIG. 6 raised. Rotating the shaft 35 counterclockwise by a corresponding amount causes the locking bolt 22 to be lowered into the position shown in full extension in FIG. 6. In the upper position, the bolt does not engage in the bolt catch, so that the mold halves can easily separate from one another in this.

To rotate the shaft mounted in the mold half 3 from its two end positions to the other end position, the shaft 35 has at its free end two stop pins or levers 38 and 39 ( FIG. 3), which lock and unlock the locking bolt 22 against each other Appropriate attacks can start. The closing stop 40 serves to lock at the beginning of the working section. If the upper stop pin 38 runs from below against the stop lug 41 of the closing stop 40 when the corresponding pair of mold halves enters the working section, the locking bolt 22 is pivoted from the dash-dotted position shown in FIG. 6 into the fully extended position in FIGS. 3 and 6 until its left flank in FIG. 3 bears snugly against the corresponding flank of the receiving groove 31 of the latch receptacle 23 . Since, depending on the manufacturing tolerances, this swivel position cannot be determined precisely to a fraction of a degree, the tip of the stop lug 41 is designed to be flexible, for example by being formed by a part which can be displaced vertically against spring pressure in the closing stop 40 . This ensures that the bolt fits snugly against the corresponding groove flank. Since the tightening of the locking flank is small, self-locking occurs here and there remains a perfect locking until the corresponding pair of mold halves 3, 4 comes into the region of the lower opening stop 44 . On its flank pointing to the right in FIG. 2, this has an oblique contact surface 45 against which the corresponding stop pin 39 of the shaft 35 runs and thereby rotates the shaft, which in turn causes the locking bolt 22 to pivot out of the receiving groove 31 . In order to avoid excessive loads here, the opening stop 44 can be preceded by an elastically flexible member, against which the stop pin 39 initially runs. The elastic member can be formed, for example, by providing a lever which can be pivoted about a vertical axis and against which the free end of the stop pin 39 , which cooperates with the stop pin 39 , can run. The force of the spring tension, under which the lever is located, then causes the opening force to be low at the beginning, which then increases very strongly. Another possibility is that the end of the lower opening stop 44 in FIG. 3 facing the viewer is designed to be pivotable downward against spring force about a horizontal axis running perpendicular to the parting plane 10 . This problem can also be influenced by appropriate design of the contact surface 45 and the cooperating surface of the stop pin 39 .

When the corresponding pair of mold halves continues to run, the stop pin 39 slides further on the surface of the lower opening stop 44 and thus prevents the locking bolt 22 from falling backwards while the mold halves are separating behind the working section. In order to ensure that the locking bolt 22 is in its open position before entering the working section, one can, for example, shortly before the lower closing stop 40 arrange an additional opening stop corresponding to the opening stop 44 , which does not have to exert any appreciable force here, since it only has the force Guaranteed open position and does not have to overcome a closing resistance. Another possibility is that, for example, the shaft 35 is provided with a corresponding latching device which allows the shaft to be pivoted between its two end positions only by overcoming a certain minimum force.

The upper transom mount 16 essentially corresponds to the lower transom mount 23 . Your receiving groove 52 cooperates with the upper locking bolt 15 . The upper locking bolt 15 is mounted by means of the bolt 53 extending perpendicular to the parting plane 10 in a slot running parallel to the plane mentioned or the guide 54 of the upper bolt guide 14 . The shape of the upper bolt guide can be seen sufficiently from FIGS . 3 and 4. The upper locking bar also engages in a lower end position like the locking bar 22 in the receiving groove 52 and in an upper end position it leaves the latter free. The left flank of the beard of the upper locking bolt 15 , like the corresponding flank of the receiving groove 52, has a light suit. However, the actuation of the upper locking bolt 15 is somewhat different than that of the lower locking bolt 22 . For actuation, a parallel to the bolt 53 extending bolt 56 is rigidly mounted on the free end of the upper locking bolt 45 , which protrudes through a corresponding vertical slot 57 in Fig. 3 to the right into the open, so that with the help of this bolt 56 also upper locking bolt can be pivoted up and down between its two end positions. An upper closing stop 60 at the beginning of the working section A , which is shown in FIGS. 1, 2 and 3, serves to pivot the upper locking bolt 15 into its blocking position.

As can best be seen from FIG. 2, this closing stop also has a nose 61 , the tip of which is resiliently supported, in that a corresponding sliding part 62 can also be pressed into the active surface of the closing stop 60 against spring force. If a corresponding pair of mold halves now runs with its bolt 56 in FIG. 2 coming from the right onto the inclined surface visible there, the bolt 56 in FIG. 3 is pressed downward (in FIG. 4 into the plane of the drawing) and thereby pushes the beard 19 of the upper locking bolt 15 into the receiving groove 52 until the left flank of the bolt in FIG. 4 is tight on the left flank of the receiving groove 52 of the bolt receptacle 16 in FIG. 5. Now the pair of mold halves is also locked at the top and remains so until the bolt 56 runs against the upper opening stop 66 after passing through the working distance. This stop is shown in FIGS. 1 and 2. As can best be seen from FIG. 2, the bolt 56 first slides when it reaches the opening stop 66 on its horizontal tongue pointing to the right until it hits the inclined surface 67 of the stop. This inclined surface lifts the stop and thus brings the locking bolt 15 into the unlocked position, so that the mold halves can now be moved apart. The horizontal guidance of the opening stop 66 adjoining the inclined surface 67 prevents the bolt from falling back into the locked position while the mold halves are being moved apart. The upper locking bolt 15 can then be held in the unlocked position by means of a simple latching device. However, it is also possible to connect the upper closing stop 60 with a short stop corresponding to the right-hand part of the opening stop 66 , so that here, too, a correct entry into the beginning of the working section A is ensured.

The device works as follows:

When entering the working section A at the right end of the device in FIG. 1, immediately after a pair of mold halves has entered the closed position, the upper and lower locking bars 15 and 22 are lowered and brought into the locked position by the closing stops 40 and 60 . In this locked position, the two molded shells of the pair of mold halves are rigidly connected to one another and thus pass through the working section until they are unlocked again after running through the working section by running the corresponding bolts against the upper or lower opening stop so that they can now move apart .

Claims (9)

1. Device for continuously deforming the wall of a thermoplastic plastic tubing strand emerging from an extruder in a still hot-plastic state, by pressing the tubing string along a working distance into the recesses on the inner wall, which is complementary to the desired outer shape of the tubular string, of a hollow shape which migrates with the hollow strand migrating in the direction of extrusion and solidified in this state,
in which device two sequences of mold halves ( 3, 4 ) are provided, which run on self-contained guides ( 8 ) and run along the working path (A) in guides ( 8 ) running parallel to each other along a hollow mold parting plane ( 10 ) and so complement each other to the moving hollow form,
a device ( 14, 16 ) is also provided which holds the mold halves ( 3, 4 ) in abutment against one another in the working section (A) ,
characterized,
that said device ( 14, 16 ) each on a mold half ( 3 ) be movably mounted locking bolts ( 15, 22 ) which in the engagement position each engage behind an engagement surface on the opposite side of the mold half ( 4 ),
that a closing device ( 40, 60 ) is provided at the beginning of the working section A , which moves the locking bolts ( 15, 22 ) there from a non-engaged position into the engaged position,
and that at the end of the working section A an opening device ( 44, 66 ) is provided, which there moves the locking bar ( 15, 22 ) from the handle position into the non-engagement position. 2. Device according to claim 1, characterized in that separate locking bolts ( 15, 22 ), and Ver closing and opening devices ( 40, 60, 44, 66 ) are provided for each of the two mold halves. 3. Apparatus according to claim 1 or 2, characterized in that the locking bolts ( 15, 22 ) in parallel to the parting plane of the hollow mold guides ( 28, 54 ) of the mold halves ( 3 ) carrying them are guided and that the engagement surfaces of the against overlying mold halves ( 4 ) also run essentially parallel to the parting plane ( 10 ). 4. Apparatus according to claim 1, 2 or 3, characterized in that the locking bolts ( 15, 22 ) are plate-shaped. 5. Device according to one of claims 1 to 4, characterized in that the locking bolts ( 15, 22 ) about the perpendicular to the parting plane ( 10 ) of the hollow mold bolts ( 56, 21 ) on the mold halves ( 3 ) supporting them are pivotally mounted. 6. The device according to claim 5, characterized in that the locking bolts ( 15, 22 ) are designed as arms extending essentially in the direction of travel of the hollow mold. 7. Device according to one of claims 3 to 6, characterized in that the locking bolt ( 15 ) can be actuated by means of pins projecting from them, which at the beginning and end of the working section A each have corresponding stops of the closing and opening devices ( 60, 66 ) can be actuated. 8. Device according to one of claims 4 to 6, characterized in that the locking bolt ( 22 ) by means of their free ends engaging pivot lever ( 34 ) can be actuated, which sit on perpendicular to the parting plane ( 10 ) extending shafts ( 35 ) which their at a distance from the parting plane ( 10 ) En carry the lever ( 38, 39 ), with which they run to actuate against stops arranged at the beginning and end of the working distance of the closing and opening devices ( 40, 44 ). 9. The device according to claim 7 and 8, characterized in that the locking bolt for the mold halves in the region of the guides ( 8 ) according to claim 8 and for the distant mold halves according to claim 7 can be actuated.